Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf98e1a334f99b1…

MALICIOUS

PDF

106.5 KB Created: 2021-09-05 14:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d10c5959aa63c26805a7b8d1cf39c449 SHA-1: 9dac1e47bfc5be0040917339704973be96bb883f SHA-256: 6bf98e1a334f99b14fddbf20728f1a1ad79c8276b020ffdc2f915c29b8da85cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/javulenukaxonevux.pdf In PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/57230216519.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a34cdf6aa---36346010419.pdfIn PDF document text
    • https://kuepancong.com/contents//files/weleratozisezodal.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210822101141247.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bcae5b11---pizip.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfc6c395e---3968049047.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3f848c97611b90e430654d698b338a72/sopinaxupul.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/50705406868.pdfIn PDF document text
    • http://esejsc.com/upload/files/baguzenotikukepu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dfd018205---96450469312.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/12535498258.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m01n55409kv04ea5n8j2kihus4/69216723720.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7857b2eba6---71726120875.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/77776705268.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a411bdeabc6---ritikikopopepuxirunulifi.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/14180023261.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/26934824487.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/kugiwitojidob.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/bomexelurepab.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/51440832768.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/vokewesun.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/dawabonadin.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/tobog.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7jon4ai6jbistftcg4kl8it167/6825374618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=social+work+critical+theory+and+practice+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4B 17936 bytes
SHA-256: d397f0f01082527726d369d4656f49254f149acebbd5bd90a13ef0f5d96ee873
font_01_sfnt_off00016ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB0 10916 bytes
SHA-256: ec90a0c4a7cb3b2355766fdd01127d674c5b4adae477d39964f7f0634f1319e1
font_02_sfnt_off000183fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1